Velocity-time graphs show how the velocity (or speed) of a moving object changes with time. These graphs also show if the object is moving at a constant speed or accelerating, decelerating, or still.

Download CBSE Class 9 Science Assertion and Reasoning Questions PDF for Biology (Tissues), Physics, and Chemistry. Get chapter-wise assertion reason questions for Chapter 1, Chapter 2, etc.

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Physics attempts to both answer philosophical questions about the nature of the universe and provide solutions to technological problems.

But in the quantum world, the laws of physics allow time evolution to be reversible—if you have the right control over the system.